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Ex 5.3, 1 - Chapter 5 Class 10 Arithmetic Progressions (Term 2)
Last updated at Aug. 3, 2021 by Teachoo
Chapter 5 Class 10 Arithmetic Progressions (Term 2)
Concept wise
- Checking if AP or not and finding a, d
- Finding nth term
- Finding n
- Finding AP
- Finding nth term from end
- Divisible/ multiples
- Statement questions - nth term
-
Finding sum of n terms
- Finding number of terms given s
- Given nth term finding s
- Statement questions - Sum of n terms
- Determining AP and finding sum
Transcript
Ex 5.3, 1 Find the sum of the following APs. (i) 2, 7, 12 ,ā¦., to 10 terms. 2, 7, 12,ā¦., to 10 term s We know that Sum of AP = š/2 (2a + (n ā 1) d) Here n = 10, a = 2, & d = 7 ā 2 = 2 Putting these in formula , Sum = š/š (2a + (n ā 1) d) = 10/2 (2 Ć 2 + (10 ā 1) Ć 5) = 5(3 + 9 Ć 5) = 5 (4 + 45) = 5 (49) = 245
